I have a question for all our esteemed GBD experts out there. Have you ever run across a GBD pipe with an original colored stem sporting the GBD rondell? I'm not referring to an amber, horn or Cumberland stem. I'm talking about a stem that's red or white. And would said stem be vulcanite I wonder? I'm assuming the pipes would be from the 70's because, well, it was the 70's, lol. Thanks!